The Wikipedia:Verifiability policy and Wikipedia:No original research require that it be possible to "directly support" all material in articles with a reliable source. For example:

All material in Wikipedia mainspace, including everything in articles, lists, and captions, must be verifiable. All quotations, and any material whose verifiability has been challenged or is likely to be challenged, must include an inline citation to a reliable source that directly supports^[1] the material.

1. ^ A source "directly supports" a given piece of material if the information is present explicitly in the source so that using this source to support the material is not a violation of Wikipedia:No original research. The location of any citation—including whether one is present in the article at all—is unrelated to whether a source directly supports the material. For questions about where and how to place citations, see Wikipedia:Citing sources, Wikipedia:Manual of Style/Lead section § Citations, etc.

A source "directly supports" the material if the source says the same thing as the material. For example:

• Wikipedia article says: Alice wrote a book.
• Reliable source says: Alice wrote a book.

These match, so that source  directly supports the material in the article.^[1]

However, when you see a situation like this:

• Wikipedia article says: Alice wrote a book.
• Reliable source says: Bunnies are fluffy and cute.

these don't match, so that source  does not support the material in the article.

It does not matter how you format the citation. It does not matter whether you type the citation very close to the material in question or at the end of the page, or even if you type it on the talk page!^[2] No amount of formatting effort will ever result in a source that only talks about bunnies being cute being considered to "directly support" a statement about Alice writing a book.